Here's a better picture showing the hydraulic reserve tank with filler cap and what I assume is a vent in the background:
on Flickr
On closer examination there is indeed a drain plug on the bottom of the tank:
on Flickr
Drain the tank and call it good? The previous owner did replace the main hydraulic cylinder on the top of the boom (boom in/out) so the fluid isn't too old and appears to be in decent shape (unlike what was left in the transmission :shock: )
I'd be interested to know any more about the Sherman backhoe and if there was any connection between that company and Parker. Parker of course is still big in hydraulic fittings but I don't think they make implements anymore. The last hurray may have been the sale of their lawn sweeper business to Ariens? Anywho, here's a shot of the serial/model plate ID tag.
on Flickr
It's pretty hard to make out but taking a pencil rubbing it looks like the top line is the Part No. 290098. The middle line is a serial number; possibly 145066. The first character could be a T? The last line is identified as "Parker Model" and looks to be 145066.
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